Abstract
Radial flow of a liquid from a point source into a porous medium by capillary suction is investigated. Theoretical treatment of the system predicts a balance between the capillary suction force causing motion and the viscous shear force opposing motion, such that a constant volume flow rate into the porous medium is maintained. This behaviour is verified experimentally, both by monitoring the rate at which liquid spreads radially into the porous medium and by determining, electrochemically, the convective transport rate at the point-source inlet to it. The device provides an inexpensive constant flow rate pump for possible use in disposable chemical sensors based on hydrodynamic measurements.
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